I'll have a go at answering this although you have to understand that attribute points are still broken overall and need a desperate fix which I hope is happening soon.

It has been found that increasing your main stats (apart from MND and VIT) has very small affect on your spells damage etc - it does affect it but not by as much as you would think - so stat rings etc with PIE and INT are not as useful as at first was thought.

MND directly affects how much MP you have, how much you can heal for and your MAG Def.

VIT directly affects how much HP you have and increases your survival chance.

These are the only two stats that seem to pay dividends at the minute.

I think (posted on these forums) tests have recently shown that 1 point is not equal to magic acc.

I would definitely go with the +3 Mag Acc rings and MAG Pot items too.

Eva - hp - and even up to a point MP stats raised through rings/gear etc are not as worth it as Mag Acc and Mag Pot.

There are a lot of people on these forums that have views and I'm sure you may get a number of them posting so like the rest of us you are going to have to 'play it by ear' and see what works best for you.

This thread, "Stats. What do they do?", asks a similar question. Ultimately, it's important to note that stats barely do anything at all and that they're getting an overhaul in about thirty-two days. For these two reasons alone, there's really no need to care about them for now.

In other words, wait for the stat overhaul; wait for jobs; wait for class balancing. All of these are coming in about a month. and stats, well, they're probably broken at the moment, anyway.

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That's the theory at least. In practice, there's really very little difference between having a large amount of INT or a small amount when it comes to attack spells, and class rank seems to be the sole domain of enfeebling spell accuracy. As a previous poster mentioned though, the devs are aware that they have a minimal, if noticeable, effect and have plans to overhaul things to make it worth putting those extra points into INT.

Whether they succeed is anyone's guess, but it would be nice to have a use for those +INT items for a change.